ChemistryChapter 20: Nitrogen Compounds-Amines
Preparation Names (school)
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem).
Learning objectives
- Explain preparation names (school) in simple chemical language.
- Connect 1. aliphatic with 2. aromatic named using equations, observations, or trends where needed.
- Answer a short Federal Board question with the correct terms and a clear reason.
Definition
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitrobenzene + Sn/HCl named if aromatic amines in the book. These are exam route names. They are not procedures to make controlled amines or dyes for harm, and not multi-step illicit synthesis. From halogenoalkane + NH3; reduction of nitrile or nitro compound — named routes. Nitrous acid behaviour differs for 1, 2, and 3 amines — classify before predicting the product.
Important terms
- PREPARATION NAMES (SCHOOL)
- From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem).
- 1. ALIPHATIC
- CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named).
- 2. AROMATIC NAMED
- Nitrobenzene reduction named (Sn/conc HCl school).
Overview
Two aliphatic routes, then aromatic name:
Aliphatic
CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named). Excess ammonia favours 1 amine. Further substitution makes 2 and 3 (named nuisance). Gabriel synthesis named for primary amine — textbook label.
Examples Excess NH3 · Nitrile reduce named · Not a plant
Aromatic Named
Nitrobenzene reduction named (Sn/conc HCl school). Phenylamine product. Azo dyes named as a later idea if the book links — names, not a dye-factory or banned-dye recipe. Not a lab manual — exam wants equation sketch only.
Examples Sn/HCl named · Phenylamine · No drug route
WHAT — PREPARATION NAMES (SCHOOL)
From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitrobenzene + Sn/HCl named if aromatic amines in the book. These are exam route names. They are not procedures to make controlled amines or dyes for harm, and not multi-step illicit synthesis. From halogenoalkane + NH3; reduction of nitrile or nitro compound — named routes. Nitrous acid behaviour differs for 1, 2, and 3 amines — classify before predicting the product.
WHY — Why this topic matters
PREPARATION NAMES (SCHOOL) is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW — How it works
ALIPHATIC: CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named). Excess ammonia favours 1 amine. Further substitution makes 2 and 3 (named nuisance). Gabriel synthesis named for primary amine — textbook label. Examples: Excess NH3; Nitrile reduce named; Not a plant. AROMATIC NAMED: Nitrobenzene reduction named (Sn/conc HCl school). Phenylamine product. Azo dyes named as a later idea if the book links — names, not a dye-factory or banned-dye recipe. Not a lab manual — exam wants equation sketch only. Examples: Sn/HCl named; Phenylamine; No drug route. Exam route: bromoethane + excess NH3 -> ethanamine or nitrile reduced (named reductant) names only, not a manufacture SOP
In simple words
Route names. No controlled-substance synthesis.
Key points
- haloalkane + NH3 named
- nitrile reduction named
- substitution
- nitro -> amino named
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Preparation Names (school)
Sticky Notes · Quick Revision
Core Idea
- From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem). From nitrile + named reductant (LiAlH4 or H2/Ni). From nitrobenzene + Sn/HCl named if aromatic amines in the book. These are exam route names. They are not procedures to make controlled amines or dyes for harm, and not multi-step illicit synthesis. From halogenoalkane + NH3; reduction of nitrile or nitro compound — named routes. Nitrous acid behaviour differs for 1, 2, and 3 amines — classify before predicting the product.
1. ALIPHATIC
- CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named). Excess ammonia favours 1 amine. Further substitution makes 2 and 3 (named nuisance). Gabriel synthesis named for primary amine — textbook label.
- Excess NH3
- Nitrile reduce named
- Not a plant
2. AROMATIC NAMED
- Nitrobenzene reduction named (Sn/conc HCl school). Phenylamine product. Azo dyes named as a later idea if the book links — names, not a dye-factory or banned-dye recipe. Not a lab manual — exam wants equation sketch only.
- Sn/HCl named
- Phenylamine
- No drug route
Exam Example
- Exam route:
- bromoethane + excess NH3 -> ethanamine
- or nitrile reduced (named reductant)
- names only, not a manufacture SOP
Common Misconceptions
- Do not confuse 1. ALIPHATIC with 2. AROMATIC NAMED; state the difference before giving an example.
- Writing only “haloalkane + NH3 named” is not enough. Explain what it means in a complete sentence.
FBISE Exam Check
- Explain preparation names (school), compare its two main parts, and include the correct chemical evidence.
- Route names. No controlled-substance synthesis.
60-second revision
- From haloalkane + NH3 (substitution, later excess NH3 to limit poly-alkylation named as a problem).
- 1. ALIPHATIC: CH3CH2Br + NH3 -> CH3CH2NH2 (then salt, then alkali to free amine named).
- 2. AROMATIC NAMED: Nitrobenzene reduction named (Sn/conc HCl school).
- Exam reminder: Exam route: bromoethane + excess NH3 -> ethanamine or nitrile reduced (named reductant) names only, not a manufacture SOP
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